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1x9m
From Proteopedia
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| - | [[Image:1x9m.gif|left|200px]] | + | [[Image:1x9m.gif|left|200px]] |
| - | + | ||
| - | '''T7 DNA polymerase in complex with an N-2-acetylaminofluorene-adducted DNA''' | + | {{Structure |
| + | |PDB= 1x9m |SIZE=350|CAPTION= <scene name='initialview01'>1x9m</scene>, resolution 2.10Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=MG:MAGNESIUM ION'>MG</scene> | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/DNA-directed_DNA_polymerase DNA-directed DNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.7 2.7.7.7] | ||
| + | |GENE= 5 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id= Bacteriophage T7]), trxA, tsnC, fipA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]) | ||
| + | }} | ||
| + | |||
| + | '''T7 DNA polymerase in complex with an N-2-acetylaminofluorene-adducted DNA''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1X9M is a [ | + | 1X9M is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Bacteriophage_t7 Bacteriophage t7] and [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1X9M OCA]. |
==Reference== | ==Reference== | ||
| - | Crystal structures of 2-acetylaminofluorene and 2-aminofluorene in complex with T7 DNA polymerase reveal mechanisms of mutagenesis., Dutta S, Li Y, Johnson D, Dzantiev L, Richardson CC, Romano LJ, Ellenberger T, Proc Natl Acad Sci U S A. 2004 Nov 16;101(46):16186-91. Epub 2004 Nov 4. PMID:[http:// | + | Crystal structures of 2-acetylaminofluorene and 2-aminofluorene in complex with T7 DNA polymerase reveal mechanisms of mutagenesis., Dutta S, Li Y, Johnson D, Dzantiev L, Richardson CC, Romano LJ, Ellenberger T, Proc Natl Acad Sci U S A. 2004 Nov 16;101(46):16186-91. Epub 2004 Nov 4. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15528277 15528277] |
[[Category: Bacteriophage t7]] | [[Category: Bacteriophage t7]] | ||
[[Category: DNA-directed DNA polymerase]] | [[Category: DNA-directed DNA polymerase]] | ||
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[[Category: replication block]] | [[Category: replication block]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 15:06:53 2008'' |
Revision as of 13:06, 20 March 2008
| |||||||
| , resolution 2.10Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | |||||||
| Gene: | 5 (Bacteriophage T7), trxA, tsnC, fipA (Escherichia coli) | ||||||
| Activity: | DNA-directed DNA polymerase, with EC number 2.7.7.7 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
T7 DNA polymerase in complex with an N-2-acetylaminofluorene-adducted DNA
Overview
The carcinogen 2-acetylaminofluorene forms two major DNA adducts: N-(2'-deoxyguanosin-8-yl)-2-acetylaminofluorene (dG-AAF) and its deacetylated derivative, N-(2'-deoxyguanosin-8-yl)-2-aminofluorene (dG-AF). Although the dG-AAF and dG-AF adducts are distinguished only by the presence or absence of an acetyl group, they have profoundly different effects on DNA replication. dG-AAF poses a strong block to DNA synthesis and primarily induces frameshift mutations in bacteria, resulting in the loss of one or two nucleotides during replication past the lesion. dG-AF is less toxic and more easily bypassed by DNA polymerases, albeit with an increased frequency of misincorporation opposite the lesion, primarily resulting in G --> T transversions. We present three crystal structures of bacteriophage T7 DNA polymerase replication complexes, one with dG-AAF in the templating position and two others with dG-AF in the templating position. Our crystallographic data suggest why a dG-AAF adduct blocks replication more strongly than does a dG-AF adduct and provide a possible explanation for frameshift mutagenesis during replication bypass of a dG-AAF adduct. The dG-AAF nucleoside adopts a syn conformation that facilitates the intercalation of its fluorene ring into a hydrophobic pocket on the surface of the fingers subdomain and locks the fingers in an open, inactive conformation. In contrast, the dG-AF base at the templating position is not well defined by the electron density, consistent with weak binding to the polymerase and a possible interchange of this adduct between the syn and anti conformations.
About this Structure
1X9M is a Protein complex structure of sequences from Bacteriophage t7 and Escherichia coli. Full crystallographic information is available from OCA.
Reference
Crystal structures of 2-acetylaminofluorene and 2-aminofluorene in complex with T7 DNA polymerase reveal mechanisms of mutagenesis., Dutta S, Li Y, Johnson D, Dzantiev L, Richardson CC, Romano LJ, Ellenberger T, Proc Natl Acad Sci U S A. 2004 Nov 16;101(46):16186-91. Epub 2004 Nov 4. PMID:15528277
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